csslint does not recognize CSS custom properties

[Brian Lewis]

csslint throws an error when it encounters a custom property (--propertyname) or reference (var(--propertyname))

csslit is unchanged for years, going forward we need better solutions for CSS management - currently removing from the build path in gruntfile

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Making an issue just to document…..

[Brian Lewis]

task(deveops): remove csslint from css build

Resolves #1027

→ <<cset 07eba395d033>>